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Engineered attic trusses

Discussion in 'Roofing and Guttering' started by OvertonPlumber, 7 Oct 2021.

  1. OvertonPlumber

    OvertonPlumber

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    We are having a loft conversion, we'll actually we are replacing the entire bungalow roof with attic Trusses. The room void is built into the truss.
    I've attached the layout drawing.

    My question Is would there be a issue raising the outside plates by 4" plus 18mm.

    My existing ceiling joists are 300mm centres 4x2 sawn. I have a pyramid 36.9% pitch roof. Ceiling joists to underside of top of roof is 3.4 mtrs.

    My new trusses have been designed to sit on the outside plates with truss clips.

    If I noggin out between the 4x2 and then put a strip of structural 18mm Ply along the top. Obviously the truss clip fixings will be oversized to engage onto the original plate.

    Two reasons for the idea it will a accommodate all the existing electrical cables if rerouted through the existing ceiling joists.
    Also it will make running the existing heating pipes easier.
    Also as and where the trusses conflict with the existing ceiling joists it wouldn't be an issue.

    I'm a plumber by trade.
     

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    Last edited: 7 Oct 2021
  2. foxhole

    foxhole

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    Roofing forum?
     
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  4. catlad

    catlad

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    I can't see it being a problem as long as your detached.
     
  5. ^woody^

    ^woody^

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    Planning permission - approved ridge height?
     
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